The second and third injection

Shorter relief calls for a fresh knee exam

Treat each shot as a new choice, not a refill. Tell the clinician when relief began and when soreness returned.

Less relief can mean your knee has changed. It can also mean cortisone isn’t helping enough now.

A quicker repeat won’t tell you which reason applies. The exam can check new swelling, weakness, and lost movement.

Bring exact dates if you have them. If you don’t, describe changes in your walking and sleep.

Studies do not give one safe yearly number

The studies didn’t use the same repeat schedule. Because the results differ, research doesn’t set one yearly maximum.

One study compared repeated cortisone with salt-water shots and found more cartilage loss after cortisone. Another study using a similar schedule didn’t find that cartilage change.

The studies don’t settle the cartilage risk. That uncertainty is one reason each repeat shot needs review.

Mention diabetes, blood thinners, infection, and planned knee surgery. A shot near knee replacement can raise infection risk, so give both clinicians the dates.

The next visit should compare all reasonable care

Ask what another shot is expected to help you do. If nobody can name that aim, repeating may not make sense.

Keep movement easy unless it sharply raises soreness. Stronger leg muscles can support your knee during normal tasks.

You can also ask about knee surgery alternatives, meaning care considered before an operation. The words don’t promise that surgery will never be needed.

Write down your main question before the visit. For soreness due to arthritis, QC Kinetix provides regenerative treatment options made from blood that medical providers draw, spin, and put into your knee at the clinic.

Sources

1. A meta-analysis of 10 RCTs of RECURRENT intra-articular corticosteroid injections (2-8 injections per patient) found they often gave inferior or non-superior relief compared with hyaluronic acid, PRP, saline or orgotein at 3 months and beyond, and no benefit over placebo in pain or function at 12-24 months.

   Donovan RL, et al. — Effects of recurrent intra-articular corticosteroid injections for osteoarthritis at 3 months and beyond: a systematic review and meta-analysis in comparison to other injectables.. Osteoarthritis Cartilage, 2022. DOI: 10.1016/j.joca.2022.07.011.

2. In a 2-year double-blind RCT of 140 patients with symptomatic knee OA and ultrasound synovitis, 40 mg intra-articular triamcinolone every 12 weeks produced significantly greater cartilage volume loss than saline (index compartment cartilage thickness change -0.21 mm vs -0.10 mm; between-group difference -0.11 mm, 95% CI -0.20 to -0.03) with no significant difference in knee pain.

   McAlindon TE, et al. — Effect of Intra-articular Triamcinolone vs Saline on Knee Cartilage Volume and Pain in Patients With Knee Osteoarthritis: A Randomized Clinical Trial.. JAMA, 2017. DOI: 10.1001/jama.2017.5283.

3. A 2-year double-blind RCT of triamcinolone every 3 months versus saline found NO difference in joint space loss between groups and significantly improved pain and stiffness with repeated steroid injections, and the authors concluded that long-term intra-articular steroid injection is safe for the anatomical structure of the knee.

   Raynauld JP, et al. — Safety and efficacy of long-term intraarticular steroid injections in osteoarthritis of the knee: a randomized, double-blind, placebo-controlled trial.. Arthritis Rheum, 2003. DOI: 10.1002/art.10777.

4. A double-blind RCT of 192 patients followed to a mean of 64 months found PRP did NOT provide superior clinical improvement over hyaluronic acid on any score at any follow-up point. Median duration of subjective symptomatic relief was 12 months for PRP and 9 months for HA (not significant). The only significant difference was a lower 24-month reintervention rate with PRP (22.6% vs 37.1%, P=.036).

   Di Martino A, Di Matteo B, Papio T, et al. — Platelet-Rich Plasma Versus Hyaluronic Acid Injections for the Treatment of Knee Osteoarthritis: Results at 5 Years of a Double-Blind, Randomized Controlled Trial.. American Journal of Sports Medicine, 2019. DOI: 10.1177/0363546518814532.

5. In a 3,822-patient cohort, 31.3% of those who received corticosteroid injections went on to knee arthroplasty versus 5.0% of those who did not; after matching, the hazard ratio was 1.57 (95% CI 1.37 to 1.81) and each injection raised the absolute nine-year risk of arthroplasty by 9.4%.

   Wijn SRW, et al. — Intra-articular corticosteroid injections increase the risk of requiring knee arthroplasty.. Bone Joint J, 2020. DOI: 10.1302/0301-620X.102B5.BJJ-2019-1376.R1.

6. The RUbICOn mixed-methods HTA study, commissioned specifically to address uncertainty about recurrent injections, combined a UK primary-care cohort (2005-2020) linked to hospital data with a safety analysis, patient and clinician interviews, and a three-round Delphi to set research priorities - the current formal acknowledgement that the long-term risks and benefits of repeat injections remain unresolved.

   Whitehouse MR, et al. — RecUrrent Intra-articular Corticosteroid injections in Osteoarthritis: the RUbICOn mixed-methods study.. Health Technol Assess, 2025. DOI: 10.3310/LFAJ9337.

7. The 2015 Cochrane review of 27 trials (1,767 participants) found intra-articular corticosteroid better than sham for knee OA pain (SMD -0.40, 95% CI -0.58 to -0.22; NNTB 8), but the benefit decayed with time: moderate at 1-2 weeks, small at 13 weeks, and no evidence of any effect at 26 weeks. All outcomes were graded LOW quality.

   Jüni P, et al. — Intra-articular corticosteroid for knee osteoarthritis.. Cochrane Database Syst Rev, 2015. DOI: 10.1002/14651858.CD005328.pub3.

8. A meta-analysis of eight RCTs found the pooled effect of intra-articular corticosteroid on knee pain was -0.58 SMD (95% CI -0.88 to -0.27; NNT 5.1), with the effect approaching statistical insignificance at four months and a non-significant pooled risk ratio for adverse effects of 0.95.

   Saltychev M, et al. — The Magnitude and Duration of the Effect of Intra-articular Corticosteroid Injections on Pain Severity in Knee Osteoarthritis: A Systematic Review and Meta-Analysis.. Am J Phys Med Rehabil, 2020. DOI: 10.1097/PHM.0000000000001384.